I am due to teach maths to a ten-year-old. I'd like to try out some games such as Nim and Conway's Soldiers. I've found this list on Wikipedia but Googling for more just gives me a load of Flash games. I want something we can do with a pen and paper, or chequerboard and pebbles, stuff like that.

Are there any good educational games which aren't on the list and can be done without special equipment?